<!DOCTYPE html>
<html>
  <head>
    <meta charset="UTF-8" />
    <!-- <meta http-equiv="X-UA-Compatible" content="IE=edge"> -->
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>发光文本动画</title>
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <h2>
      <span style="--i: 1">H</span>
      <span style="--i: 2">e</span>
      <span style="--i: 3">l</span>
      <span style="--i: 4">l</span>
      <span style="--i: 5">o</span>
      <span style="--i: 6; margin-left: 5vw">H</span>
      <span style="--i: 7">s</span>
      <span style="--i: 8">z</span>
      <span style="--i: 9">z</span>
    </h2>
  </body>
</html>
